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Chapter 2: Q14. (page 41)

Can an object have zero acceleration and non-zero velocity at the same time? Give examples.

Short Answer

Expert verified

Yes, an object can have zero velocity and still be accelerating.

Step by step solution

01

Step 1. Definitions of velocity and acceleration

Velocity is a vector quantity and is defined as the rate of change of displacement of an object with time. On the other hand, acceleration is the time rate of change of velocity.

02

Step 2. Determination of velocity for zero acceleration

The acceleration is a=dvdt.

For zero acceleration, 0=dvdt.

This implies that the velocity is constant. Now, this constant value can take up any value, such as 5m/sor 7km/h.

For example, a car is under straight-line uniform motion, moving with a non-zero constant velocity of 80km/h. In this case, the acceleration is zero as there is no change in velocity.

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Most popular questions from this chapter

A runner hopes to complete the 10,000-m run in less than 30.0 min. After running at constant speed for exactly 27.0 min, there are still 1200 m to go. The runner must then accelerate at0.20ms-2for how many seconds in order to achieve the desired time?

In Fig. 2-44, (a) during what time periods, if any, is the velocity constant? (b) At what time is the velocity greatest? (c) At what time, if any, is the velocity zero? (d) Does the object move in one direction or in both directions during the time shown?

Figure 2-44 Problems 57,58 and 59

A sprinter accelerates from rest to 9.00m/s in 1.38 s. What is her acceleration in (a) m/s2 and (b) km/h2?

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A stone is thrown vertically upward with a speed of 24.0 m/s. (a) How fast is it moving when it is at a height of 13.0 m? (b) How much time is required to reach this height? (c) Why are there two answers to (b)?
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